CRITICAL 9.1
GHSA-89gr-r52h-f8rx
golang.org/x/crypto/ssh: FIDO/U2F security key physical presence check can be bypassed
Details
The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.
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Affected packages
Go / golang.org/x/crypto/ssh
Introduced in:
0 Fixed in: 0.52.0 Fix
go get golang.org/x/crypto/ssh@v0.52.0